/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.netbeans.modules.dashboard;

import java.util.List;
import org.netbeans.spi.dashboard.DashboardDisplayer;
import org.openide.util.Lookup;

/**
 *
 */
public class DefaultDashboardDisplayer implements DashboardDisplayer {

    static DashboardDisplayer instance;

    private DefaultDashboardDisplayer() {

    }

    @Override
    public Lookup getLookup() {
        return Lookup.EMPTY;
    }

    @Override
    public void show(String category, List<WidgetReference> widgets) {
        DashboardTopComponent.show(this, widgets);
    }

    public static synchronized DashboardDisplayer findOrDefault() {
        if (instance == null) {
            DashboardDisplayer dd = Lookup.getDefault().lookup(DashboardDisplayer.class);
            if (dd != null) {
                instance = dd;
            } else {
                instance = new DefaultDashboardDisplayer();
            }
        }
        return instance;
    }

    static boolean isDefaultDisplayer() {
        return findOrDefault() instanceof DefaultDashboardDisplayer;
    }

}
